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Total 51 documents matching your query.

41. Re: [Amps] 3cx800 flashover ? (score: 1)
Author: "Carel, pc5m" <pc5m@xs4all.nl>
Date: Wed, 21 Aug 2013 19:19:10 +0200
Tnx Peter/Carl/Bill, Tube is now on with heather/blower, let's see what happens next Friday .... 73's Carel, pc5m Try running it with filament volts only for 48 hours - apparently the getters on the
/archives//html/Amps/2013-08/msg00118.html (8,422 bytes)

42. Re: [Amps] 3cx800 flashover ? (score: 1)
Author: "Carel, pc5m" <pc5m@xs4all.nl>
Date: Sat, 24 Aug 2013 17:38:22 +0200
Hi, small report on my 3cx800 project... After more than 24hrs heather on (didnt dear to let it running unattended overnight...) first test did show indeed improved vacuum ! flashovers started at hig
/archives//html/Amps/2013-08/msg00123.html (9,893 bytes)

43. [Amps] minimum length of 1:1 transmission line balun ? (score: 1)
Author: "Carel, pc5m" <pc5m@xs4all.nl>
Date: Tue, 22 Oct 2013 17:49:44 +0200
Hi, busy constructing a QRO 2 mtrs power amp with balanced FET's. It will a.o. be utilizing a rudimentary (coax) 1:1 balun at in- and output to transform 50Ohm unbalanced to 2 times 25 Ohm balanced (
/archives//html/Amps/2013-10/msg00397.html (7,409 bytes)

44. Re: [Amps] GS23B Plate load resistance for HF (score: 1)
Author: "Carel, pc5m" <pc5m@xs4all.nl>
Date: Mon, 28 Oct 2013 22:29:53 +0100
Hi Dave, you might give my "RF Tube modeller" application a try. It will easily calculate a.o. efficiency, Rload and other parameters. All based on the constant current graphs as provided by the manu
/archives//html/Amps/2013-10/msg00440.html (9,476 bytes)

45. Re: [Amps] Sampling RF at input and output of an amplifier (score: 1)
Author: "pc5m, Carel" <pc5m@xs4all.nl>
Date: Thu, 16 Jan 2014 17:02:41 +0100
Hi Pete, I have used my soundcard for this together with some DC on the relays input. With e.g. Audacity you can see very good the timing. Of course digital oscilloscope (if at hand) is simpler.... 7
/archives//html/Amps/2014-01/msg00078.html (7,474 bytes)

46. Re: [Amps] 50V 90A Voltage Current Sensor $15.88? (score: 1)
Author: "Carel, pc5m" <pc5m@xs4all.nl>
Date: Sun, 15 Jun 2014 07:52:24 +0200
Sure, look at the datasheet of the mentioned IC: INA-169 http://www.ti.com/lit/ds/symlink/ina169.pdf 73's Carel, pc5m OK, what am I missing? 50V 90A Voltage Current V/I Sensor Board $15.88 http://www
/archives//html/Amps/2014-06/msg00018.html (8,118 bytes)

47. [Amps] Bagley splitter/combiner (score: 1)
Author: "Carel, pc5m" <pc5m@xs4all.nl>
Date: Mon, 16 Jun 2014 20:42:48 +0200
Hi, Has anyone some experience with the "bagley polygon" as splitter/combiner for VHF ? <http://www.dc2light.pwp.blueyonder.co.uk/Webpage/Hybridcouplers.htm> http://www.dc2light.pwp.blueyonder.co.uk/
/archives//html/Amps/2014-06/msg00028.html (6,980 bytes)

48. Re: [Amps] GS-23B (score: 1)
Author: "Carel, pc5m" <pc5m@xs4all.nl>
Date: Sat, 16 Aug 2014 21:00:19 +0200
Use it in a cavity, around 1 kW out on 70cm. Think you will need to apply maximum anode voltage as possible to get good power (as usual of course...) See http://www.pc5m.net/projects/432mhz-gs23b 73'
/archives//html/Amps/2014-08/msg00045.html (7,961 bytes)

49. [Amps] push pull or parallel ? (score: 1)
Author: "Carel, pc5m" <pc5m@xs4all.nl>
Date: Mon, 26 Jan 2015 16:41:48 +0100
Hi, 160mtrs contest past and we need more power... Plan is to add 3 dB by throwing in another tube (2.5kw anode dissipation Tetrode, grid driven). I could go for push-pull of just parallel the tube's
/archives//html/Amps/2015-01/msg00296.html (7,296 bytes)

50. Re: [Amps] push pull or parallel ? (score: 1)
Author: "Carel, pc5m" <pc5m@xs4all.nl>
Date: Mon, 26 Jan 2015 19:40:34 +0100
Hi, 160mtrs contest past and we need more power... Plan is to add 3 dB by throwing in another tube (2.5kw anode dissipation Tetrode, grid driven). I could go for push-pull of just parallel the tube's
/archives//html/Amps/2015-01/msg00304.html (10,616 bytes)

51. Re: [Amps] Understanding S Parameters (score: 1)
Author: "Carel, pc5m" <pc5m@xs4all.nl>
Date: Tue, 16 Jun 2015 22:45:08 +0200
Hi Drax, If S11 > 1 it means it is not unconditional stable, i.e. it might oscillate... Your formula for input impedance is only valid if s12 or s21 = 0, and I think that is not the case. Otherwise:
/archives//html/Amps/2015-06/msg00039.html (8,111 bytes)

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